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Static relativistic finite gas normalization and hydrostatics
Statement
Let be an open interval and an open bounded coordinate box with compact closure and positive volume. On a neighborhood of , with assigned metres and in seconds, prescribe the smooth static metric where is positive definite with eigenvalues bounded above and away from zero, and the lapse satisfies . The static unit observer is , so ; this is a prescribed background, not a solution sourced by the gas.
Use SI units: particle mass is in , is in , orthonormal momentum is in , and local energy is in . In any local orthonormal coframe, and , so ; orthonormal-frame changes are rotations and preserve . This defines a fibre measure without assuming a global frame. Use the fixed action reference in and in : Then , with all polynomial momentum moments and compact-positive- derivatives finite. For each fixed particle count , the classical ideal-gas preparation with Gibbs factor has ; a grand fugacity preparation with dimensionless has .
Define and the proper local densities Their units are , , and , respectively. With and , the exact model identities are If with in joules, the local chemical parameter is . No Einstein equation, self-consistent gas backreaction, interacting quantum trace, or arbitrary curved-space mode spectrum is asserted.
Facts & Assumptions
Given: A bounded positive-volume region, smooth prescribed static metric data satisfying the stated uniform bounds, , and the classical ideal-gas preparation.
The phase-reference item fixes the action unit and the convention that a phase integral is dimensionless after division by its corresponding power. (Finite gravitational phase and entropy reference)
If an integrable section is differentiable in a parameter and its derivative has an integrable uniform majorant on a neighborhood, differentiation passes through the integral. (Differentiation under the integral sign)
Tonelli factors nonnegative measurable integrals on products of sigma-finite measure spaces. (Tonelli's theorem for nonnegative measurable functions on a sigma-finite product)
Proof
In a local orthonormal coframe, and , so . Hence and . The transition matrix between orthonormal coframes is orthogonal and has absolute determinant one, so this fibre measure is independent of the chosen local coframe.
In the orthonormal momentum variables, , so . The right side is integrable on : reduces its integral to a product of three finite one-dimensional exponential integrals. The same comparison with polynomial factors gives every energy moment and a common majorant for in compact positive intervals. Each derivative of the integrand is ; [F2] therefore gives for every finite order. The proper volume of is finite by compactness and the metric eigenvalue bounds, and positive because has positive volume and . Thus is finite and strictly positive. For independent labelled particles, Tonelli [F3] factors the product integral; the fixed classical indistinguishable-particle counting convention divides by , giving . Summing grand weights yields .
At a fixed , put . On a momentum cube , integrate The constant factor in cancels from the moments. Here and , so the divergence terms are integrable under the exponential bound of step 1.2. On a face with , and , hence . Each face integral is therefore bounded by a constant times , which tends to zero. The integral of the divergence over is zero, and division by gives .
For each spatial coordinate , . The derivatives of the lapse are bounded on the compact closure, , and has the integrable majorant from step 1.2. Hence [F2] gives . Differentiating and substituting this identity yields Finally, rewriting as gives .